The Sound Blaster X-Fi sound card driver for Linux from
Creative Labs was awful. That's simply the nicest way to put it. The
driver was home to many bugs, initially only supported 64-bit Linux, and
it was arriving extremely late. The open-source drivers supporting the
Creative X-Fi drivers have also been at a stand still. However, Creative
Labs today has finally turned this situation around and they have
open-sourced the code to this notorious driver. The source-code for the
Creative X-Fi driver is now licensed under the GNU GPLv2.